<html> Hi Wim,              Sounds like the hammer rail has been installed in the wrong position. (Rotated towards the back of the action)  Screw a few balance rail punching's under the rear action bracket feet, to diagnose.   If the piano is under warranty, get them to fix it.   Fudging the hammer line/ dip is one possible solution.  Shimming the rear feet.  And or a little of both.  But it is still a cheater  fix. Regards Roger At 11:02 AM 8/19/02 -0400, you wrote: <blockquote type=cite class=cite cite>I regulated a B Friday, and now there are about 3 or 4 notes in the octave just above the break where the jack is hitting the hammer flange on a hard blow.  Upon close inspection, when I bring the wippen up, I can make the top of the jack touch the bottom of the hammer flange on some of the notes, but not on others. I can't seem to figure out why it is doing it. What makes the jack stop it's upward motion when the wippen is pushed up? Wim </blockquote> </html>